Vibrations of Multi-Electron Bubbles: Phonons and Ripplons
Abstract
Vibrational modes of a multi-electron bubble (MEB) in liquid helium are investigated taking into account the ripplonic-polaron effect. It is shown, that in a MEB, the strong-coupling regime is realized for ripplonic polarons. A giant increase of the effective mass of a ripplonic polaron with respect to that for a bare electron strongly influences vibrational eigenfrequencies of a MEB. Namely, the phonon frequencies for a ripplonic-polaron Wigner lattice in a MEB are much lower than those for an electron Wigner lattice in a spherical layer. This property of the phonon modes might be used for experimental detection of the formation of a ripplonic-polaron Wigner lattice in a MEB with lowering temperature. At liquid-helium temperatures, the solid state for ripplonic polarons in a MEB is shown to be thermodynamically preferable with respect to the ripplonic-polaron liquid.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MARU22006K